mybatis和redis整合 log4j打印sql语句

首先，需要在项目中引进jedis-2.8.1.jar包，在pom.xml里加上

<dependency>
      <groupId>redis.clients</groupId>
      <artifactId>jedis</artifactId>
      <version>2.8.1</version>
</dependency>

在mybatis的配置文件中加上<property name="configurationProperties">里的一段

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!-- 自动扫描mapping.xml文件 -->
        <property name="mapperLocations" value="classpath:com/cn/*/mapping/*.xml"></property>
        <property name="configurationProperties">
            <props>
                <prop key="cacheEnabled">true</prop>
                <prop key="lazyLoadingEnabled">false</prop>
                <prop key="aggressiveLazyLoading">true</prop>
                <prop key="multipleResultSetsEnabled">true</prop>
                <prop key="defaultExecutorType">REUSE</prop>
                <prop key="defaultStatementTimeout">25000</prop>
            </props>
        </property>
        <!--  <property name="configLocation" value="classpath:mybatis-config.xml" /> -->
</bean>

编写redis用到的工具类SerializeUtil.java

package com.cn.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class SerializeUtil {
   public static byte[] serialize(Object object) {
    ObjectOutputStream oos = null;
    ByteArrayOutputStream baos = null;
    try {
        //序列化
        baos = new ByteArrayOutputStream();
        oos = new ObjectOutputStream(baos);
        oos.writeObject(object);
        byte[] bytes = baos.toByteArray();
        return bytes;
        } catch (Exception e) {
         e.printStackTrace();
         return null;
        }
    }  

    public static Object unserialize(byte[] bytes) {
      ByteArrayInputStream bais = null;
      try {
        //反序列化
        bais = new ByteArrayInputStream(bytes);
        ObjectInputStream ois = new ObjectInputStream(bais);
        return ois.readObject();
       } catch (Exception e) {
             return null;
       }
    }
}

新增一个MybatisRedisCache类，需要实现 org.apache.ibatis.cache.Cache 接口

package com.cn.util;

import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import org.apache.ibatis.cache.Cache;
import org.apache.log4j.Logger;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

public class MybatisRedisCache implements Cache{

      private  Logger logger = Logger.getLogger(getClass());
      private Jedis redisClient = createClient();
      /** The ReadWriteLock. */
      private final ReadWriteLock readWriteLock = new ReentrantReadWriteLock();

      private String id;

      public MybatisRedisCache(final String id) {
        if (id == null) {
          throw new IllegalArgumentException("Cache instances require an ID");
        }
        logger.info(">>>>MybatisRedisCache:id=" + id);
        this.id = id;
      }

      @Override
      public String getId() {
        return this.id;
      }

      @Override
      public int getSize() {
        return Integer.valueOf(redisClient.dbSize().toString());
      }

      @Override
      public void putObject(Object key, Object value) {
        //logger.info(">>>>putObject:" + key + "=" + value);
        redisClient.setex(SerializeUtil.serialize(key.toString()), 1000,SerializeUtil.serialize(value));
      }

      @Override
      public Object getObject(Object key) {
        Object value = SerializeUtil.unserialize(redisClient.get(SerializeUtil.serialize(key.toString())));
        //logger.info(">>>>getObject:" + key + "=" + value);
        return value;
      }

      @Override
      public Object removeObject(Object key) {
        return redisClient.expire(SerializeUtil.serialize(key.toString()), 0);
      }

      @Override
      public void clear() {
        redisClient.flushDB();
      }

      @Override
      public ReadWriteLock getReadWriteLock() {
        return readWriteLock;
      }

      protected  static Jedis createClient() {
        try {
          JedisPool pool = new JedisPool(new JedisPoolConfig(), "127.0.0.1");
               return pool.getResource();
        } catch (Exception e) {
          e.printStackTrace();
        }
        throw new RuntimeException("初始化连接池错误");
      }

}

在mapper.xml里加上

<cache type="com.cn.util.MybatisRedisCache" />

Java对象需要实现Serializable接口

package com.cn.entity;

import java.io.Serializable;

public class User implements Serializable{
    private static final long serialVersionUID = -154635138564326678L;

    private Integer id;

    private String userName;

    private String password;

    private Integer age;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName == null ? null : userName.trim();
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password == null ? null : password.trim();
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

测试的话可以用log4j打印mybatis执行的sql语句

需要在log4j配置文件里配置：

log4j.logger.org.springframework=ERROR
log4j.logger.org.compass=ERROR
log4j.logger.org.quartz=ERROR
#log4j在控制台打印sql语句
log4j.logger.com.ibatis=DEBUG
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=DEBUG
log4j.logger.com.ibatis.common.jdbc.ScriptRunner=DEBUG
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=DEBUG
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG
#定义LOG输出级别
log4j.rootLogger=DEBUG,Console,File
#定义日志输出目的地为控制台
log4j.appender.Console=org.apache.log4j.ConsoleAppender
#可以灵活地指定日志输出格式，下面一行是指定具体的格式
log4j.appender.Console.layout = org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d %p [%c] - %m%n
#文件大小到达指定尺寸的时候产生一个新的文件
log4j.appender.File = org.apache.log4j.RollingFileAppender
#指定输出目录
log4j.appender.File.File = logs/ssm.log
#定义文件最大大小
log4j.appender.File.MaxFileSize = 1MB
# 输出所有日志，如果换成DEBUG表示输出DEBUG以上级别日志
log4j.appender.File.Threshold = ALL
log4j.appender.File.layout = org.apache.log4j.PatternLayout
log4j.appender.File.layout.ConversionPattern =[%p] [%d{yyyy-MM-dd HH\:mm\:ss}][%c]%m%n